GoTo.com search lists paying customers, who bid for the highest position in the search rankings for certain keywords, first. This can leave out a lot of the useless websites that frequently clutter search results, particulary if you are searching for a commercial site.

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411Web People Finder
Find people with the fastest growing on-line phone and address directory. They have yellow pages, too.SMARTpages.com
SmartPages has yellow pages (biz listings), white pages (people finder), city guides, shopping guides, and more. It pays to shop around, because all online 'phone books' do not have the same content.